AMERICAN HYMENOI'TKRA. 155 



anterior coxae, and trochanters, their feinora at tips aud beneath, their 

 tibiae and tarsi in front, a line on posterior tibia? and tarsi exteriorly, 

 and a trilohetl hand at tip of pttstpetiole, all white ; "the scutelluiu is 

 flat; the postpetiole sparsely punctured, shining, second, third aud 

 iburth segments densely punctured ; gastrocoeli large and very deep. 

 Length % .55 — .65 inch. 



55. infidelis, Cress. Trans. Am. Ent. Sec. i, p. 296, I . 



Hah. — Mass., Ot. A rather large subrobust black species, with 

 abdomen tinged with blue towards apex which is smooth and shining, 

 while the second, third and fourth segments are longitudinally striated 

 on the middle; the head and thorax are marked as in Azotna, except 

 that the clypeus has a central black spot, the pleura has two white 

 spots beneath wings, the anterior one transverse, the posterior one 

 round, and the flanks of metathorax have a large rounded white spot; 

 wings clear; anteunsE long, entirely black ; postpetiole broadly white 

 at tip. and the third segment is stained with dull yellow on apical 

 margin ; the legs are considerably ornamented with white, the pos- 

 terior femora having a white stripe above, which is unusual. Length 

 % .t;0 inch. 



56. unifasciatorius, Say, Am. Ent. pi. 22. 



iiiyrr. lirulle, llvm. p. 302. 

 Jfab. — Can., Mass., Pa., Md., Ga., 111. This common species is of 

 a deep dull black color, the abdomen of 9 often slightly tinged with 

 blue; anterior orbits, aiinulus on anteun*, tegulse, a line before and 

 short one beneath, scutellum and sometimes a spot behind, a stripe on 

 all the tibi^e exteriorly and tip of postpetiole, all white; the % has the 

 face white, generally more or less marked with black, and the clypeus 

 is white, marke<l with black at tip; in the 9 the face is black, with 

 the orbits only narrowly white; wings of $ are clear, of the S more 

 or less smoky at tips and .sometimes uniformly fuscous and violaceous. 

 One S from Canada has the face entirely black except four white 

 spots arranged in a trausvci-se line immediately beneath the antenna 

 and the clypeus black with a white spot on each side. Length % 9 

 .50 — .65 inch. 



57. otiosus, Say. Contrib. Macl. Iac i, p. 69. 



Jiah. — Can.. J^a., N. J., Del., III. Closely resembles unl/andatorius 

 9 . but at oiuje distinguished by the round white spot on flanks of 

 metathorax. and the two short white lines on disc of mesothorax. 

 Length 9 .50 — .63 inch. 



